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Road traffic statistics

18476

Details

AADF latest year 2024
Region London
Local authority Hillingdon
Road name A4
Road type Major
Start junction road LA Boundary
End junction road A3044
Link length 0.60km (0.37 miles)
Easting & Northing 504500,177160
Latitude & longitude 51.48375,-0.49643

Location

Contents

Average Annual Daily Flow

Average annual daily flow
Year Count method All motor vehicles Cars & taxis LGVs HGVs Pedal cycles Motorcycles Buses & coaches
2024 Automatic counter 19,296 12,759 4,477 1,233 52 265 563
2023 Automatic counter 17,276 11,411 3,993 1,119 54 242 511
2022 Automatic counter 18,044 11,783 4,223 1,212 57 272 554
2021 Automatic counter 16,131 10,619 3,628 1,148 58 239 497
2020 Automatic counter 13,912 9,254 3,021 1,016 78 220 401
2019 Automatic counter 21,261 14,738 4,126 1,325 61 342 730
2018 Automatic counter 21,415 14,844 4,184 1,318 51 321 747
2017 Automatic counter 21,247 14,866 3,983 1,281 42 327 790
2016 Estimated using AADF from previous year on this link 23,214 16,417 4,159 1,371 46 370 897
2015 Estimated using AADF from previous year on this link 22,671 16,216 3,851 1,326 46 370 909
2014 Estimated using AADF from previous year on this link 21,740 15,741 3,465 1,252 46 358 925
2013 Estimated using AADF from previous year on this link 21,036 15,386 3,228 1,252 58 347 822
2012 Manual count 20,921 15,572 3,041 1,183 59 329 796
2011 Estimated using AADF from previous year on this link 21,848 17,453 2,795 1,188 14 76 336
2010 Estimated using AADF from previous year on this link 21,902 17,558 2,732 1,202 16 77 333
2009 Manual count 22,229 17,990 2,663 1,176 16 87 313
2008 Estimated using AADF from previous year on this link 22,361 16,930 2,628 2,298 52 289 216
2007 Estimated using AADF from previous year on this link 22,464 17,049 2,624 2,282 51 297 212
2006 Estimated using AADF from previous year on this link 22,233 17,169 2,367 2,176 51 296 225
2005 Estimated using AADF from previous year on this link 21,750 16,882 2,259 2,103 53 273 233
2004 Estimated using AADF from previous year on this link 21,769 17,002 2,159 2,080 51 284 244
2003 Manual count 21,163 16,717 1,941 1,931 53 280 294
2002 Estimated using AADF from previous year on this link 21,722 16,957 2,409 1,901 50 272 183
2001 Estimated using AADF from previous year on this link 21,093 16,480 2,390 1,780 47 266 177
2000 Estimated using AADF from previous year on this link 20,356 15,984 2,263 1,695 53 242 172

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Data disclaimer

Traffic figures at the regional and national level are robust, and are reported as accredited official statistics. However, DfT’s traffic estimates for individual road links and small areas are less robust, as they are not always based on up-to-date counts made at these locations. Where other more up-to-date sources of traffic data are available (e.g. from local highways authorities), this may provide a more accurate estimate of traffic at these locations.

It is the responsibility of the user to decide which data are most appropriate for their purpose, and if DfT road link level traffic estimates are used, to make a note of the limitations in any published material.

Quality flags in data downloads

DfT’s road link level traffic estimates are calculated using a variety of methods, with some methods likely to produce more accurate estimates than others.

The data tables available to download here contain a column - estimation_method – showing the method used to estimate traffic for each location and year. Figures having an estimation method of “Counted” are likely to be more accurate than those marked as “Estimated”, and the latter should be used with caution.

Site details
Manual count point site 18476 details
Average annual daily flow
Number of vehicles that travel past the count point (in both directions) on an average day of the year.
Average annual daily flow by direction
Number of vehicles that travel past the count point on an average day of the year, by direction of travel.
Raw counts
Vehicle counts recorded at this count point.
Data Description Records Download
Site details Manual count point site 18476 details 1
Average annual daily flow Number of vehicles that travel past the count point (in both directions) on an average day of the year. 25
Average annual daily flow by direction Number of vehicles that travel past the count point on an average day of the year, by direction of travel. 50
Raw counts Vehicle counts recorded at this count point. 72

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